Super large power electromagnetic suction push-pull driving sound source

Abstract

The invention relates to an ultra-large power electromagnetic suction push-pull driving sound source, comprising a base, an upper coil and a lower coil which are arranged inside the base, a vibration part which is arranged at the clearance between the upper coil and the lower coil, and an acoustic radiator which is arranged at the upper side of the base; the upper coil and the lower coil are arranged in the same axle; furthermore, the upper coil and the lower coil have the same winding direction; the sound source also comprises a control signal processing circuit which comprises a half-wave rectifier circuit that respectively provides the positive signal part and the negative signal part of the control signal to the upper coil and the lower coil. The ultra-large power electromagnetic suction push-pull driving sound source has the remarkable advantages that the ultra-large sound power output can be generated, the energy conversion efficiency is high and the nonlinear distortion can be inhibited.

Description

technical field [0001] The invention belongs to the field of acoustics, in particular, the invention relates to a super-high-power electric excitation sound source. Background technique [0002] Traditional electric excitation sound sources include electric, electromagnetic, piezoelectric, magnetostrictive and other forms. Its disadvantage is that the power is limited, and it cannot produce super-power (generally above 100-sound-watt level) acoustic emission; the other is that the efficiency is low. Specifically, as Figure 1a The horn-type electric loudspeaker (or electric underwater acoustic transducer, electric airflow loudspeaker) shown in the figure uses the coil to move linearly under the action of Lorentz force in the magnetic gap to drive the diaphragm 1 to vibrate and produce sound , the driving force is low, and the electro-acoustic conversion efficiency is low; in addition, the amplitude of the coil cannot exceed the length of the magnetic gap; Coil loosening wi...

AI Technical Summary

Problems solved by technology

The disadvantage is that the power is limited, and it cannot produce super-power (generally above 100 sound watts) acoustic emission; the other is that the efficiency is low

The first problem of this kind of speaker is that its annular permanent magnet and annular magnetic conductive plate do not cover the sound film and voice coil, and there is serious magnetic flux leakage; the second problem is that when the force on the three voice coils is not completely uniform, Only using three-point vibration will cause the diaphragm to vibrate in phase separation, which is easy to damage the diaphragm; the third problem is that the two permanent magnets are opposite to each other with the same polarity, and without forming a closed magnetic circuit, it is easy to demagnetize, so it is impossible to produce a large magnet. power sound output

The first problem with this solution is that the ampere-turn number of the voice coil is low, and it is impossible to generate a large magnetic force, so it is not suitable for generating super-high-power sound; the second problem is that it is a dipole sound source, and the radiation efficiency is low; The three problems are that the generated sound has serious nonlinear distortion; the fourth problem is that there is a coil on the sound film, which is easy to be damaged, and the power cannot be large

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